|Publication number||US7267205 B2|
|Application number||US 11/162,206|
|Publication date||Sep 11, 2007|
|Filing date||Aug 31, 2005|
|Priority date||Aug 31, 2005|
|Also published as||CN1923604A, CN1923604B, EP1759978A2, EP1759978A3, EP1759978B1, US20070051567|
|Publication number||11162206, 162206, US 7267205 B2, US 7267205B2, US-B2-7267205, US7267205 B2, US7267205B2|
|Inventors||Keiji Matsueda, Keita Tanaka|
|Original Assignee||Shimano, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (18), Referenced by (1), Classifications (12), Legal Events (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention is directed to bicycle brake devices and, more particularly, to bicycle brake devices that are used to brake a hub of a bicycle wheel.
Bicycle braking devices currently available include rim braking devices and hub braking devices. Rim braking devices include cantilever brakes or caliper brakes that brake the rim of the wheel. Hub braking devices brake the wheel hub, and they include drum brakes, band brakes, roller brakes and the like. A hub brake brakes the hub of the wheel, so it is able to provide braking even if the wheel rim is warped.
A drum brake such as a roller brake effects braking by means of friction created when a brake shoe contacts the inside peripheral face of a tubular brake drum that rotates in unison with the wheel hub. A band brake effects braking by means of friction created when a brake belt contacts the outer peripheral face of a brake drum. In a roller brake, rollers spaced apart in the circumferential direction are displaced diametrically outward by a cam in order to move a brake shoe against the inner peripheral face of the brake drum.
In brake devices of this kind, there is provided a brake actuator having an actuating arm for moving the brake shoe or brake band into contact with the brake drum, wherein the basal end of the brake arm is rotatably mounted to a fastening bracket. The inner cable of a Bowden brake cable is attached to the distal end of the actuating arm so that pulling and releasing the inner cable relative to the outer cable of the Bowden cable rotates the actuating arm. The outer cable of the Bowden cable usually is attached to the bicycle frame or to the fastening bracket.
The basal portion of the actuating arm typically is housed within a casing formed by the fastening bracket and a hub cap that attaches to the fastening bracket. The actuating arm extends through a slot formed in a side surface of the casing, and the inner cable of the Bowden cable is attached to the distal end of the actuating arm. Unfortunately, the extending portion of the actuating arm forms a projection that can snag on obstacles encountered while riding the bicycle. Furthermore, the inner cable of the Bowden cable usually is attached to the actuating arm using a nut and bolt assembly such that the nut and bolt must be disassembled whenever the cable is to be removed from the actuating arm. Not only does this increases the labor required to remove the bicycle wheel, but the brakes must be readjusted every time the inner cable is reattached.
The present invention is directed to inventive features of a bicycle braking device. In one embodiment, an apparatus is provided for actuating a bicycle hub brake of the type having a fastening bracket adapted to be nonrotatably mounted relative to a bicycle frame, a brake drum, and a brake mechanism adapted to apply a braking force to the brake drum, wherein the brake drum rotates integrally with a bicycle hub around a hub axle. The apparatus comprises an actuating member and a rotating member. The actuating member is structured to be movably mounted relative to the fastening bracket for actuating the brake mechanism, and the rotating member is structured to be rotatably mounted relative to the fastening bracket independently of the actuating member. The rotating member includes an actuating member moving unit for moving the actuating member.
In another embodiment, an apparatus is provided for actuating a bicycle hub brake, wherein the bicycle hub brake includes a brake drum and a brake mechanism adapted to apply a braking force to the brake drum, wherein the brake drum rotates integrally with a bicycle hub around a hub axle. The apparatus comprises a fastening bracket adapted to be nonrotatably mounted relative to a bicycle frame and having an opening dimensioned to receive a hub axle therethrough, an actuating member structured to be movably mounted relative to the fastening bracket for actuating the brake mechanism, and a rotating member structured to be rotatably mounted relative to the fastening bracket, wherein the rotating member has an opening dimensioned to receive the hub axle therethrough. The rotating member includes an actuating member moving unit for moving the actuating member. The rotating member also includes a cable winding surface to wind a brake actuating cable thereon.
Additional inventive features will become apparent from the description below, and such features alone or in combination with the above features may form the basis of further inventions as recited in the claims and their equivalents.
Front wheel 6 and rear wheel 7 have front and rear hubs 6 a (
As shown in
In this embodiment, the front and rear brake devices 13 f, 13 r are roller brake devices. Brake devices 13 f, 13 r function to brake the hub 6 a of front wheel 6 and rear wheel 7, respectively. As shown in
Each fastening bracket 30 f, 30 r has a bracket body 34 with a first face and a second face produced, for example, by press forming a sheet of steel. Bracket body 34 has a base portion 34 a (
The detaining portion 34 c of bracket body 34 is fastened to front fork 3 or chainstay 2 a through a bracket fastening member 25 f or 25 r and an insert member 19. The brake manufacturer supplies bracket fastening member 25 f together with the front brake device 13 f, and it is welded to the front fork 3 of the bicycle frame 1. Bracket fastening members 25 f, 25 r have mounted (e.g., screwed) thereon outer mounting portions 31 f, 31 r for detaining outer cables 17 f, 17 r, respectively. As shown in
Since brake mechanisms 32 f, 32 r are of substantially identical structure, only front brake mechanism 32 f will be described in detail. As shown in
A circular brake face 51 a is formed on the inside peripheral face of peripheral portion 51 of drum body 43, wherein brake shoe 41 is capable of contacting with and releasing from brake face 51 a to provide a braking force to brake drum 40. Brake face 51 a is produced by recessing the axial center portion of peripheral portion 51 in a trapezoidal shape whose cross section constricts in width going radially outwardly.
In this embodiment, as shown in
Brake actuating units 33 f, 33 r are substantially identical in construction despite their difference in shape, so only the front brake actuating unit 33 f will be described in detail. Brake actuating unit 33 f is used to push the segments of brake shoe 41 towards brake drum 40. As shown in
Actuating arm 60 is fabricated from a metal plate. The basal end of actuating arm 60 is bent and has a mating hole 60 a for mating with the outside peripheral face of cam portion 61. Actuating arm 60 rotates between a brake released position (shown in
Cam member 61 is nonrotatably fixed to actuating arm 60 so that it rotates in response to rotation of actuating arm 60, and it may be formed by a thick-walled tubular member made of steel. As shown in
Rollers 62 are mounted between the outer peripheral surface of cam member 61 and the roller contacting faces 41 d of brake shoe 41. Rollers 62 push against brake shoe 41 in response to the rotation of cam member 61. Rollers 62 are mounted in roller case 63 such that they are spaced apart in a circumferential direction while being capable of radial movement in response to rotation of cam member 61. More specifically, a plurality of (e.g., six) retaining projections 63 a are formed in roller case 63. Retaining projections 63 a are circumferentially spaced apart and project outwardly in the hub axial direction for retaining rollers 62. Roller case 63 is nonrotatably detained to bracket body 34 by means of a retaining projection 63 b that projects axially further than the other retaining projections 63 a and engages retaining slot 34 g in bracket body 34. A third spring member 72 is mounted between retaining projection 63 b and bracket body 34 for biasing roller case 63 in the clockwise direction in
Actuating member moving unit 92 comprises elongated generally rectangular projections 92 a and 92 b. In this embodiment, projection 92 a extends radially inwardly at an incline from an inner peripheral surface 84 b of outer peripheral flange 84. In other words, a phantom axis Y defined by the direction of projection 92 a does not intersect the center of opening 80. Similarly, projection 92 b extends radially inwardly at an incline from inner peripheral surface 84 b of outer peripheral flange 84 so that a phantom axis Z defined by the direction of projection 92 b does not intersect the center of opening 80. In this embodiment, phantom axes Y and Z straddle central opening 80.
Projections 92 a and 92 b are spaced apart from each other such that, when cover member 35 is mounted to fastening bracket 30 f, projections 92 a and 92 b straddle the distal end of actuating arm 60. Thus, rotating cover member 35 in a clockwise direction shown in
As shown more clearly in
During assembly, the drum body 43 and cooling disk 44 forms are fabricated by a process such as die casting or forging, and the forms are then finished to the desired dimensions by machining processes. Cooling disk 44 then is mounted onto the outside peripheral surface of drum body 43 in a known manner. Then, two segments of brake shoe 41 and the first spring member 53 are assembled and mounted inside the drum body, and the remaining segment of brake shoe 41 is attached. The interior may be packed with ample grease at this time. When the mounting of brake shoe 41 is completed, the segments of brake shoe 41 are pushed against brake face 51 a, the rollers 62 are mounted in the roller case 63, and rollers 62 and roller case 63 are inserted radially inwardly of brake shoe 41. The interior may be further coated with ample grease at this time. Then, cam member 61 with the attached actuating arm 60 is inserted radially inwardly of rollers 62, third spring member 72 is hooked between bracket body 34 and detaining projection 63 b of roller case 63, and cover member 35 is placed over hub axle 15 a.
To attach brake cable attachment unit 104 to inner cable 16 f, inner cable 16 f is threaded through the opening in locking portion 124 of shank 116 of bolt 108. Then, washer 112 is placed on locking portion 124, with inner surfaces 112 a and 112 b of washer 112 engaging the corresponding flat surfaces 124 a and 124 b of locking portion 124. Finally, nut 110 is screwed onto threaded portion 120 of bolt 108 to fasten inner cable 16 f to bolt 108. Brake cable attachment unit 104 then is oriented so that outer surfaces 112 c and 112 d of washer 112 align with parallel walls 35 b and 35 c of cover member 35, and brake cable attachment unit 104 is inserted into opening 100 in brake control element mount 82.
When assembling the front wheel 6 having the brake device 13 f mounted thereon onto the front fork 3, the insert member 19 mounted on the detaining portion 34 c of bracket body 34 of brake device 13 f is pushed into bracket fastening portion 25 f, and the hub axle 15 a of hub 6 a is mounted on front fork 3. The hexagonal cap nuts 45 are then installed on both ends of hub axle 15 a and tightened to the appropriate level of torque to retain cover member 35 to fastening bracket 30 f and complete the mounting of front wheel 6.
The disassembly procedure is the reverse of the above. Unlike conventional brake cable retaining devices, brake cable 16 f can be detached from cover member 35 simply by removing brake cable attachment unit 104 without the use of tools. When brake cable 16 f is reattached, the former adjustment of brake shoe 41 is maintained, so the adjustment of brake shoe 41 need not be repeated.
The operation of brake devices 13 f, 13 r will be described with reference to the front brake device 13 f described above. With the brake cables 14 f, 14 r set up, the inner cables 16 f, 16 r are under tension, and play between brake shoe 41 and brake drum 40 in the absence of operation of brake levers 12 f, 12 r may be adjusted by means of the outer detaining portion 22 mounted on brake levers 12 f, 12 r or the outer mounting portions 31 f, 31 r mounted on brake device 13 f, 13 r. In this state, squeezing front brake lever 12 f pulls inner cable 16 f, thus causing cover member 35 to rotate counterclockwise. At this time, the parallel outer surfaces 112 c and 112 d of washer 112 rotate out of alignment with parallel walls 35 b and 35 c of cover member 35 because brake control element mount 82 rotates relative to the rotationally stationary brake cable attachment unit 104. Because width W2 between curved walls 112 e and 112 f is greater than width W1 between parallel walls 112 c and 112 d, curved walls 112 e and 112 f, and hence washer 112, cannot pass between walls 35 ba and 35 c of cover member 35. This prevents brake cable attachment unit 104 from detaching from cover member 35, further enhancing reliability of the connection.
The counterclockwise motion of cover member 35 is communicated through side surface 92 b′ of projection 92 b of cover member 35 to side surface 60 c actuating arm 60, thereby rotating actuating arm 60 counterclockwise in opposition to the biasing force of second spring member 70. As a result, actuating arm 60 rotates from the brake release position shown in
When actuating arm 60 rotates to the braking position, cam member 61 rotates integrally therewith, and the rollers 62 ride up over the sloped cam faces 61 a. As a result, rollers 62 are displaced radially outwardly and press the contact faces 41 a of brake shoe 41 against the brake face 51 a of brake drum 40 in opposition to the biasing force of first spring member 53. This initially produces a braking force proportional to the pushing force on brake shoe 41. Since brake drum 40 is rotating in the counterclockwise direction of
When the hand is released from front brake lever 12 f, actuating arm 60 rotates clockwise to the brake released position in accordance with the biasing force of the second spring member 70, and cover member 35 rotates clockwise accordingly as a result of the contact between side surface 60 c of actuating arm 60 and side surface 92 b′ of projection 92 b. Since cam member 61 rotates integrally with actuating arm 60, rollers 62 ride down the sloped cam faces 61 a, and brake shoe 41 moves radially inwardly in accordance with the biasing force of first spring member 53. At this time, the roller case 63 rotates in the clockwise direction in accordance with the biasing force of third spring member 72, and the braking force stops.
While the above is a description of various embodiments of inventive features, further modifications may be employed without departing from the spirit and scope of the present invention. For example, while a roller brake for braking the wheel hub was described, but the hub brake device is not limited thereto. The inventive features may be applied to a band brake or drum brake for braking the hub. The brake face 51 a and contact face 41 a in the described embodiment have a trapezoidal configuration, but the brake face 51 a and contact face 41 could be flat faces instead.
In the embodiment described above, the outer mounting portion 31 f for detaining the outer cable 17 f is disposed on a bracket fastening member 25 f that has been welded to the front fork 3, but an outer mounting portion 131 f could instead be disposed on an arm portion 134 b of a bracket body 134 of a fastening bracket 130 f as shown in FIG. 19. In this embodiment, arm portion 134 b has formed thereon an outer mounting bracket 134 h that projects rearwardly (to the right in
As shown in
Outer detaining portion 131 a has a tubular rod configuration for receiving inner cable 16 f therethrough. A male thread portion 131 c is formed on the outer periphery of outer detaining portion 131 a for screwing onto the outer fastening bracket 131 b. The position of this outer detaining portion 131 a along the cable axis may be adjusted by the screwing position of the outer detaining portion 131 a relative to the outer fastening bracket 131 b. The outer detaining portion 131 a is held in position on outer fastening bracket 131 b by means of a lock nut 131 d that threads onto male thread portion 131 c.
Bending a metal plate, for example, may form outer fastening bracket 131 b. Outer fastening bracket 131 b has a mounting portion 131 e having the outer detaining portion 131 a screwed thereto, a back wall portion 131 g that bends downward in
Mounting portion 131 e has formed therein a female thread portion 131 k (
Side wall portions 131 h are produced by bending, leaving gaps equal to the thickness of back wall portion 131 g and outer mounting bracket 134 h. Outer mounting bracket 134 h thus slides between the back edges of side wall portions 131 h (the right edge in
With an outer mounting portion 131 f of this design, outer cable 17 f can be removed by detaching outer fastening bracket 131 b from outer mounting bracket 134 f. This outer fastening bracket 131 b is a larger component than conventional outer fastening portions, so it is easier to attach or detach with one hand, and the outer cable 17 f is more easily attached and detached as well. Also, since outer detaining portion 131 a is nonrotatably detained with respect to outer mounting bracket 134 h, outer detaining portion 131 a does not rotate during mounting or riding. Thus, the outer cable attaching/detaching operation when attaching or detaching the wheel can be performed with ease, and the outer cable 17 f is securely fastened.
The size, shape, location or orientation of the various components may be changed as desired. Components that are shown directly connected or contacting each other may have intermediate structures disposed between them. The functions of one element may be performed by two, and vice versa. The structures and functions of one embodiment may be adopted in another embodiment. It is not necessary for all advantages to be present in a particular embodiment at the same time. Every feature which is unique from the prior art, alone or in combination with other features, also should be considered a separate description of further inventions by the applicant, including the structural and/or functional concepts embodied by such feature(s). Thus, the scope of the invention should not be limited by the specific structures disclosed or the apparent initial focus or emphasis on a particular structure or feature.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US9163707||Mar 31, 2014||Oct 20, 2015||Mtd Products Inc||Method for controlling the speed of a self-propelled walk-behind lawn mower|
|U.S. Classification||188/26, 188/24.22, 188/2.00D, 188/17|
|Cooperative Classification||F16D2125/30, F16D2121/14, F16D51/10, B62L1/005, F16D2125/62|
|European Classification||B62L1/00B, F16D51/10|
|Aug 31, 2005||AS||Assignment|
Owner name: SHIMANO, INC., JAPAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MATSUEDA, KEIJI;REEL/FRAME:016479/0324
Effective date: 20050829
Owner name: SHIMANO, INC., JAPAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TANAKA, KEITA;REEL/FRAME:016479/0326
Effective date: 20050829
|Feb 10, 2011||FPAY||Fee payment|
Year of fee payment: 4
|Apr 24, 2015||REMI||Maintenance fee reminder mailed|
|Sep 11, 2015||LAPS||Lapse for failure to pay maintenance fees|
|Nov 3, 2015||FP||Expired due to failure to pay maintenance fee|
Effective date: 20150911